Redis (I) -- getting to know redis for the first time

brief introduction

Redis It's based on key value pairs (key-value) Of NoSQL database

SQL and NoSQL difference

	SQL	NoSQL
data structure	structured	Unstructured
Data Association	The associated	Unrelated
A query	SQL Inquire about	Not SQL
Transaction features	ACID	No transaction （ Cannot satisfy strong consistency ）
storage	disk	Memory
Extensibility	vertical	level
Use scenarios	The data structure is fixed ; Relevant businesses have high data consistency and security	The data structure is not fixed ; The data consistency and security of related businesses are not high ; Performance requirements

Redis characteristic

• Data structure server based on key value pairs ,value Support a variety of different data structures , Rich in functions
• Single thread . Each command is consistent
• Low latency , Fast （ Memory based 、IO Multiplexing 、 Good coding ）
• Support data persistence
• Support the master-slave cluster , Fragmentation cluster
• Support for multilingual clients

install

Default startup mode

yum install gcc tcl -y
wget https://download.redis.io/releases/redis-6.2.7.tar.gz
mv redis-6.2.7.tar.gz /usr/local/src/
tar -zxvf redis-6.2.7.tar.gz
cd redis-6.2.7
make && make install
redis-server

Background startup mode

cp redis.conf redis.conf.default
vim redis.conf

# Modify the following configuration 
bind 0.0.0.0
daemonize yes
# Daemon , It is amended as follows yes Background start 
requirepass 123456
# Set up redis Access code for 

redis-server /usr/local/src/redis-6.2.7/redis.conf
ps -ef|grep redis

Write service startup

vim /etc/systemd/system/redis.service

[Unit]
Description=redis-server
After=network.target

[Service]
Type=forking
ExecStart=/usr/local/bin/redis-server /usr/local/src/redis-6.2.7/redis.conf
PrivateTmp=true

[Install]
WantedBy=multi-user.target

Then reload the system services

systemctl daemon-reload

Now? , We can use the following set of commands to operate redis 了 ：

#  start-up 
systemctl start redis
#  stop it 
systemctl stop redis
#  restart 
systemctl restart redis
#  Check the status 
systemctl status redis

Execute the following command , It can make redis Boot from boot ：

systemctl enable redis

redis-cli -h 127.0.0.1 -p 6379 -a 123456